Wetterstationen des Deutschen Wetterdienstes (DWD)
| Stationsname (Ort) | Seehöhe | Bundesland |
| Inzigkofen | 620 m | BW |
| Ippesheim | 262 m | BY |
| Ippesheim-Herrnberchtheim | 297 m | BY |
| Irlbach | 320 m | BY |
| Irschenberg | 730 m | BY |
| Irschenberg-Kasthub | 713 m | BY |
| Isen-Westach | 549 m | BY |
| Iserlohn | 220 m | NW |
| Iserlohn (PH) | 280 m | NW |
| Iserlohn-Letmathe | 124 m | NW |
| Iserlohn-Rheinen | 135 m | NW |
| Iserlohn-Roden | 222 m | NW |
| Iserlohn-Westig | 230 m | NW |
| Isernhagen | 80 m | NI |
| Isernhagen-Lohne | 65 m | NI |
| Isert (DLR RLP) | 312 m | RP |
| Isingdorf | 170 m | NW |
| Isling | 380 m | BY |
| Isny | 712 m | BW |
| Isny-Bolsternang | 769 m | BW |
| Isselburg-Anholt | 17 m | NW |
| Isseroda | 352 m | TH |
| Isserstedt | 325 m | TH |
| Issing | 720 m | BY |
| Issum-Vrasselt | 25 m | NW |
| Istein | 260 m | BW |
| Ittenbach | 240 m | NW |
| Itterkraftwerk | 163 m | BW |
| Ittertal-Herzhausen | 245 m | HE |
| Itzehoe | 21 m | SH |
| Itzehoe (Gaswerk) | 5 m | SH |
| Itzehoe-Klosterforst | 30 m | SH |
| Itzgrund-Herreth | 367 m | BY |
| Itzing | 500 m | BY |
| Ivenack | 50 m | MV |
| Ivenrode | 135 m | ST |
| Jachenau | 765 m | BY |
| Jachenau-Niedernach | 803 m | BY |
| Jachenau-Tannern | 720 m | BY |
| Jade | 2 m | NI |
| Jägerthal | 198 m | RP |
| Jagstzell | 466 m | BW |
| Jakobsthal | 400 m | BY |
| Jänickendorf | 55 m | BB |
| Jeddingen | 55 m | NI |
| Jedesheim | 518 m | BY |
| Jena (Falkenstieg) | 170 m | TH |
| Jena (Kläranlage) | 137 m | TH |
| Jena (Ringwiese) | 156 m | TH |
| Jena (Sternwarte) | 155 m | TH |