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Historical race-week conditions

Hottest 70.3 and 140.6 triathlon races

Compare the temperatures athletes usually meet—and the hotter conditions worth preparing for—across IRONMAN-branded and independent 70.3 and 140.6 races.

5070.3 races
22140.6 races
5Years sampled

Next 180 days

Upcoming races with the hottest historical conditions

70.3 rankings

Sorted by the 90th-percentile daily high around each event date. Branded IRONMAN events are identified separately from independent 70.3 races.

50 races with weather data

Hot day, highest first

#RaceHotRH
01

Aug 16, 2026

108°F49%
02
IRONMAN 70.3 BOISE

Jul 25, 2026

103°F29%
03

Jul 19, 2026

96°F74%
04

Jul 25, 2026

94°F88%
05

Aug 9, 2026

94°F80%
06
IRONMAN 70.3 OREGON

Jul 19, 2026

93°F63%
07
IRONMAN 70.3 WACO

Oct 4, 2026

93°F69%
08

Jun 7, 2026

92°F72%
09

Jun 14, 2026

92°F72%
10

Jun 13, 2026

91°F74%
11

Sep 19, 2026

91°F92%
12

Aug 16, 2026

90°F86%
13

Jul 25, 2026

90°F83%
14

Jul 25, 2026

90°F81%
15
IRONMAN 70.3 OMAHA

Jun 7, 2026

89°F78%
16

Jul 26, 2026

89°F89%
17

Jun 7, 2026

88°F85%
18

Jul 12, 2026

88°F62%
19

Jul 12, 2026

87°F87%
20

Jul 18, 2026

87°F91%
21
IRONMAN 70.3 OHIO

Jul 19, 2026

87°F86%
22

Jul 26, 2026

87°F88%
23
IRONMAN 70.3 MUNCIE

Jul 11, 2026

86°F85%
24

May 1, 2027

86°F79%
25

Jun 14, 2026

85°F71%
26

Sep 20, 2026

85°F56%
27

May 16, 2027

84°F87%
28

Jun 21, 2026

83°F73%
29

Jun 5, 2027

83°F83%
30

May 8, 2027

83°F90%
31

Feb 20, 2026

83°F85%
32

Jun 6, 2026

83°F85%
33

Jul 11, 2026

83°F82%
34

Sep 12, 2026

83°F84%
35

Mar 14, 2027

82°F82%
36

Jun 14, 2026

82°F82%
37

Sep 19, 2026

82°F88%
38

Dec 13, 2026

81°F86%
39

Sep 13, 2026

81°F88%
40

Dec 6, 2026

80°F44%
41

Sep 5, 2026

80°F94%
42

Oct 24, 2026

79°F84%
43

Sep 20, 2026

79°F85%
44
IRONMAN 70.3 TEXAS

Apr 4, 2027

77°F92%
45

Sep 26, 2026

76°F90%
46

Mar 13, 2027

70°F93%
47

Apr 12, 2026

68°F85%
48

Apr 19, 2026

68°F83%
49

Apr 4, 2026

67°F88%
50

Mar 29, 2026

50°F74%

140.6 rankings

A preparation comparison, not a prediction. The hot-day value shows a historically plausible upper-end condition for that race week.

22 races with weather data

Hot day, highest first

#RaceHotRH
01

Mar 21, 2026

104°F86%
02

May 21, 2026

95°F85%
03

Nov 12, 2026

93°F67%
04

Jul 11, 2026

93°F78%
05

Nov 13, 2026

93°F68%
06

Sep 12, 2026

91°F80%
07

Nov 1, 2026

90°F53%
08

Apr 25, 2026

89°F86%
09

Jun 6, 2026

88°F78%
10

May 23, 2026

87°F62%
11

Aug 16, 2026

86°F84%
12

Oct 18, 2026

86°F80%
13

Sep 27, 2026

85°F90%
14

Nov 7, 2026

84°F85%
15

Apr 24, 2027

84°F90%
16

Sep 13, 2026

83°F84%
17

Jul 19, 2026

81°F89%
18

Aug 15, 2026

81°F80%
19

Sep 6, 2026

80°F88%
20

Sep 19, 2026

78°F91%
21

Sep 19, 2026

77°F91%
22

May 10, 2026

76°F83%

How these rankings work

EnduranceOS uses Open-Meteo archive data from the previous five calendar years. For each race, we sample the seven-day window centered on its event date and calculate temperature and humidity percentiles.

“Typical” is the median daily high. “Hot day” is the 90th-percentile daily high—not the all-time record and not a forecast. Weather can vary substantially by start time, course location, and year.

All listed weather profiles were refreshed on or after Jul 22, 2026. Data refresh runs daily and this page revalidates within 24 hours.

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